To answer that question, Dr Maguire plotted the differences in the size of the structure against the amount of time that an individual had been driving a cab.

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The biggest differences in those technologies and the patent for which Apple filed is the amount of power consumed by the product, said Michael Filler, a Caltech postdoctoral scholar specializing in photovoltaics.

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Yet despite the differences in protein and fat intake, the level of body fat increased by essentially the same amount among all the participants.

WSJ: New Ways Calories Can Add Up to Weight Gain

Gen Kayani has invested an equal amount of time and energy in maintaining a close relationship with the US military, despite differences ever since the Afghan Taliban were defeated in 2001.

BBC: Deepening military rift between the US and Pakistan

Differences between politicians here are often measured by the amount of occupied Palestinian land that they are prepared to give up in return for a peace deal.

BBC: Tough road ahead for Livni